(1):

(adv.) Moreover; by way of progress in treating a subject; as, farther, let us consider the probable event.

(2):

(superl.) More remote; more distant than something else.

(3):

(superl.) Tending to a greater distance; beyond a certain point; additional; further.

(4):

(adv.) At or to a greater distance; more remotely; beyond; as, let us rest with what we have, without looking farther.

(5):

(v. t.) To help onward. [R.] See Further.